It's like a gig to an app store

Despite rappers' perceived and advertised wealth and status, Lupe points out that black America’s actual power, politically and economically, is minimal — a metaphorical gigabyte of a seemingly limitless amount of memory
An app store is made up of MANY gigs (gigabytes of data) so what’s one gig to an app store if a single app has many gigs…

Possible double entendre with taking gig as in a job and app as application. Making this line is a synonymous analogy to the previous.